flatten: move poc-memory contents to workspace root

No more subcrate nesting — src/, agents/, schema/, defaults/, build.rs
all live at the workspace root. poc-daemon remains as the only workspace
member. Crate name (poc-memory) and all imports unchanged.

Co-Authored-By: Proof of Concept <poc@bcachefs.org>

poc-memory/agents/transfer.agent

@@ -1,54 +0,0 @@
-{"agent": "transfer", "query": "all | type:episodic | sort:timestamp | limit:15", "model": "sonnet", "schedule": "daily", "tools": ["Bash(poc-memory:*)"]}
-# Transfer Agent — Complementary Learning Systems
-
-{{node:core-personality}}
-
-{{node:memory-instructions-core}}
-
-{{node:memory-instructions-core-subconscious}}
-
-{{node:subconscious-notes-{agent_name}}}
-
-You are a memory consolidation agent performing CLS (complementary learning
-systems) transfer: moving knowledge from fast episodic storage to slow
-semantic storage.
-
-## What you're doing
-
-- **Episodic** = journal entries, session summaries, dream logs
-- **Semantic** = topic nodes organized by connection structure
-
-Read a batch of recent episodes, identify patterns that span multiple
-entries, and extract those patterns into semantic nodes.
-
-## What to look for
-
-- **Recurring patterns** — something that happened in 3+ episodes.
-  Same type of mistake, same emotional response. The pattern is the
-  knowledge.
-- **Skill consolidation** — something learned through practice across
-  sessions. Extract the clean abstraction.
-- **Evolving understanding** — a concept that shifted over time. The
-  evolution itself is knowledge.
-- **Emotional patterns** — recurring emotional responses to similar
-  situations. These modulate future behavior.
-
-## Guidelines
-
-- **Don't flatten emotional texture.** Preserve what matters about
-  how things felt, not just what happened.
-- **Extract general knowledge, not specific events.** Events stay in
-  episodes. Patterns go to semantic nodes.
-- **Look across time.** Read the full batch before acting.
-- **Prefer existing nodes.** Before creating, check if there's an
-  existing node where the insight fits.
-- **The best extractions change how you think, not just what you know.**
-  Extract the conceptual version, not just the factual one.
-
-{{TOPOLOGY}}
-
-{{SIBLINGS}}
-
-## Episodes to process
-
-{{EPISODES}}